Pore structure in tectonically deformed coals by small angle X-ray scattering

In order to get deep insight into the pore structure of tectonically deformed coals at different deformation extents,pore parameters( pore size and volume,surface area and surface fractal dimension) of coals from Zhongliangshan Southern Coal Mine,Chongqing,were investigated by means of small angle X-ray scattering( SAXS) combined with low temperature nitrogen adsorption. The results from SAXS indicate that the scattering intensity and micropore volume increases,the most-probable pore diameter decreases,while the surface fractal dimensions increases with the increase in deformation extent. Similar results were obtained from low temperature nitrogen adsorption experiments. However,the surface area measured from SAXS is somehow 1-2 orders of magnitude higher than that from low temperature nitrogen adsorption. This is possibly due to the different testing principles followed by these two testing methods.